sorry for taking so long to respond, i was never told when people commented on my videos for some reason so its hard to keep up. now to get to your question, i guess so, but plastic will work best, so as long as it is plastic, it should be ok.

They should all work, since they are all plastic they should be fine, and to go along with your previous question, since you will only use 4 ping pong balls, you can use some of the things you just mentioned (like a plastic bag) to fill up the rest of the space! :D Good Luck!

Sure, 4 will work, but it won't fill up an entire ping pong ball probably. If you have 6, it should fill a ping pong ball completely, but it will still work with just 4, there will just be a little less smoke. :D

Once you're done cutting the ping pong balls, take the little pieces and stick them in the hole in the first ping pong ball. Then once all the little pieces are in, take the bigger piece and squish it in the hole and then move it around to close it up from the inside.

Is that really necessary? can a little plastic/ packaging tape will do? or maybe rubber bands?

I'm not entirely sure. Considering the plastic tape is plastic, it should be fine, but for me, I normally just take a bigger piece of the ping pong ball and put it inside to close off the hole. If you're feeling adventurous, then go ahead! Tell me how it goes! :D

Don't add a bunch! start with a little bit, then build up a bit at a time. Also, if you are making a ton of these, go to a charity store or a yard sale and get an old electric coffee grinder to shred the balls.

thanks again! the only problem i can think of using a blender is that it might get jammed with the little pieces or it might simply just not work... we'll see?! Another idea one of my friends gave me which is what he did was to simply smash them into pieces with a hammer, so if you feel barbarious (i think that's the word for acting like a barbarian?!) then you could try that! ;)

I have an old coffee grinder that I use to cut up everything from nuts to aluminum foil. If it somehow does clog, it would take about ten seconds to unclog. Only bother with a coffee grinder if you need to shred a whole bunch of ping pong balls though.